diff --git a/poincare/src/simplify/rules.pr b/poincare/src/simplify/rules.pr
index 8a27eb103..6df7b14ce 100644
--- a/poincare/src/simplify/rules.pr
+++ b/poincare/src/simplify/rules.pr
@@ -1,4 +1,3 @@
-/* */
 Addition(Addition(a*),b*)->Addition(a*,b*);
 Addition(Integer.a,Integer.b)->$AddIntegers(a,b);
 Addition(Integer.a,Integer.b,c*)->Addition($AddIntegers(a,b),c*);
diff --git a/poincare/src/simplify/rules_generation/rules_lexer.l b/poincare/src/simplify/rules_generation/rules_lexer.l
index 98cc01c1e..49ad03ea6 100644
--- a/poincare/src/simplify/rules_generation/rules_lexer.l
+++ b/poincare/src/simplify/rules_generation/rules_lexer.l
@@ -23,7 +23,6 @@
 \; { return(SEMICOLON); }
 \. { return(PERIOD); }
 "//".* {} /* ignore single line comments */
-"/*".*"*/" {} /* ignore multiline comments */
 
 [ \t\n] {} /* ignore line jump and whitespaces */